after playing http://store.steampowered.com/app/545720/ for a few minutes and being unable to use my steam controller with Xbox input, and being unable to use the DS4 with all the correct xbox settings within the config window, he pointed me to here.

any chance steam controller support can be fixed so i can use my controller in the game ;P ? would be really nice!

it can emulate Xbox input (X-Input) and keyboard/mouse input, but the API itself is controlled by steam and does not do Xinput or Dinput itself, its a new API for the steam controller and (at the moment) dualshock 4 controller.

but, besides that, i do not believe the SC API is set up to do dinput functions. not sure how many games support dinput anymore, but i assume if enough devs were to bother valve they would add dinput support.

Well that explains a lot. The development process is undergoing some changes here in the next few weeks anyway that may make XInput a lot more viable than it was before, so a future BYOND version may moot this issue.